板中采用绑扎钢筋作配筋时，其受力钢筋的间距：板厚A≤150mm时，不应大于（）。²A 发布时间：2017-05-19 05:09 │ 来源：www.tikuol.com 题型：单项选择题 问题： 板中采用绑扎钢筋作配筋时，其受力钢筋的间距：板厚A≤150mm时，不应大于（）。²A.300mmB.200mmC.100mmD.50mm
题型：单项选择题 阅读理解。 The world out of doors is full of secrets. There are so many secrets, and they are so interesting that thousands of men and women, boys and girls are busy studying them. All around us are birds, animals,trees and flowers. The facts about how they live and grow are interesting. Do you know that one of the greatest presidents of the USA spent hours and hours studying birds? A businessman who lived near New York City became so interesting in insects that he began to collect them. He now has over one thousand different kinds of insects. He kept them carefully in glass boxes. Then, come with me, and I will help you find some of the nature's secrets. Let us go quietly through the forests and fields. Here we shall find how a hare tells the other hares where the danger is. We shall follow a mother bear and her young babies as they try to look for food and get ready for their long winter sleep. We shall watch bees dancing in the air to tell the other bees where they can find food. I'll show you many other interesting things. But please remember to use your eyes and ears carefully when you go out of the doors. Nature tells the secrets only to people who look and listen carefully. 1. Secrets of nature are so interesting that _____ are busy studying them. [ ]A. thousnad of men and women B. thousands of students C. thousands of boys and girlsD. Both A and C 2. _____ now has more than one thousand different kinds of insects and he kept them in glass boxes. [ ]A. The president of the USAB. A president of the USA C. A businessman near New York City D. A businessman near Washington 3. When bees dance in the air, they can tell the other bees _____. [ ]A. where the danger is B. where their home isC. where the food is D. where they can sleep 4. From the passage we can know that _____ usually sleep during the long winter. [ ]A. hares B. bees C. bears D. snakes 5. People can get to know the secrets of nature _____. [ ]A. by going throught the forests and fieldsB. by collecting many kinds of insects.C. by being interesting in them D. by looking and listening carefully out of doors. v 查看答案
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